第 26 回稲盛フロンティア研究セミナー

第 26 回稲盛フロンティア研究セミナー
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日時：平成 28 年 12月 16日（金）16:00～17:00
場所：稲盛財団記念館 2F セミナー室
The Mechanisms of Proton Conduction in Systems based
on Phosphorous Oxoacids
Klaus-Dieter Kreuer
Max-Planck-Institute for Solid State Research, Stuttgart
(Germany)
From a fundamental point of view, the family of compounds known as phosphorous oxoacids are among
the most intriguing proton conducting systems. Neat liquid phosphoric acid (H3PO4) has the highest
intrinsic proton conductivity of any known substance, systems containing phosphates play a central
role in the structure and function of biological systems and are attracting increasing interest as
electrolytes for emerging fuel cell applications.
Here, we describe our current understanding of proton conduction in phosphorous acid based systems
and compares this to the proton conduction mechanism in water and hydrated systems (such as Nafion).
Most of our notion is based on recent ab initio molecular dynamics simulations, NMR and impedance
spectroscopy indicating the formation of polarized chains by correlated proton transfers along chains
of hydrogen bonds in a close sense to the original notion of Grotthuss mechanism for proton
conduction in water. The depolarization process required to release long range proton transport
(structural diffusion) is suggested to be controlled by “hydrogen bond network frustration”, i.e.
the imbalance of the numbers of potential proton donors and acceptors.
The highest network frustration is observed for neat phosphoric acid which shows the highest
structural proton conductivity. Higher ionic conductivities are observed with increasing water
content, but this conductivity is related to the diffusion of extended charged species (e.g. H3O+,
H2PO4-) which is detrimental e.g. for fuel cell performance.
Klaus-Dieter Kreuer
Max-Planck-Institute for Solid State Research,
Stuttgart (Germany)
After receiving his Diploma in Mineralogy at the University of Cologne (1979), Klaus-Dieter Kreuer
did a PhD in the department of Chemistry at the University ofStuttgart (1979-82). As a fellow of the
“Studienstiftung des Deutschen Volkes” hebenefited from a research stay at the California Institute
of Technology (group of R. Vaughan, 1978) and a Max-Planck award allowed him to join the Massachusetts
Institute of Technology (1983/84) as a visiting scientist. Later, Klaus-Die,ter Kreuer built an R&D
group for Electrochemical Sensors within a Swiss-German company (Endress & Hauser, 1985-91) before
joining the Max-Planck-Institute for Solid State Research (1992), where he assisted J. Maier in
building his new department. Since 1990
Klaus-Dieter Kreuer is lecturing (Werkstoffwissenschaften) at
the University of Stuttgart from which he received his Habilitation degree (1999).
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